Mika arrives in Poland to pay a hospital visit to her father, who is suffering from severe brain injury and memory loss. It's the first time they have met in many years, yet her father thinks they still live together and she's a teenager. For a brief time Mika becomes her father's companion in his befuddlement gently guiding him through the labyrinth of his fading mind. And as she does so, she sets off on a journey through her own life.

An exceptionally gifted teenage boy is about to start studying physics at university. He is working on the theory of parallel worlds, which are linked, he initially believes, by light. He has an extraordinary mind and a wounded soul, which his mother, who steers his life, is incapable of healing.